Microsoft Outlook Fail to Launch and fetch

Test New Outlook through a different connection—preferably a phone hotspot—because this exact BootResult: network, TypeError: Failed to fetch, and StartupData pattern indicates that Outlook cannot retrieve required startup data, even though Windows otherwise has Internet access.^1^

1. Isolate the network path

Since the built-in troubleshooter, waiting, and multiple restarts have already failed:

1. Disconnect the PC from its current Wi-Fi or Ethernet connection.
2. Connect it to a phone hotspot or another independent network.
3. Start new Outlook.
4. Interpret the result:
   • Outlook opens: the original network is blocking or interfering with Outlook’s startup request. Temporarily turn off any VPN, proxy, DNS/ad filtering, antivirus “web shield,” or HTTPS scanning and test on the original network again. Also review router filtering or parental-control settings.
   • The same error occurs: continue with the local app repair below.
5. Also open Outlook mail in a browser. If it fails on multiple devices and independent networks, the issue may be account- or service-side rather than confined to this PC.

The current Microsoft list of recent new Outlook issues does not document this exact startup error as a general known issue.^2^

2. Repair new Outlook

1. Open Start → Settings → Apps → Installed apps.
2. Find Outlook (new) or Outlook for Windows.
3. Select the three dots → Advanced options.
4. Select Terminate, and then select Repair.
5. Launch Outlook and check whether it reaches the mailbox.

Repair attempts to fix the app without removing its data.^3^

3. Reset the app if Repair fails

Return to:

Settings → Apps → Installed apps → Outlook → Advanced options → Reset

Reset returns the app to its default state and may remove locally stored app data, so account sign-in may be required afterward.^3^

Then open Outlook and add the email account again if prompted.

Do not use classic Outlook tools such as outlook.exe /safe, classic profile repair, or classic Outlook connectivity troubleshooters for this error. Microsoft states that classic Outlook troubleshooters do not apply to new Outlook for Windows.^4^

4. Reinstall new Outlook

If the failure remains on another network after Repair and Reset:

1. Open Start and locate Outlook (new).
2. Right-click it and select Uninstall.
3. Open Microsoft Store.
4. Search for Outlook for Windows, select Get, and launch it after installation.
5. Add the account again if it is not restored automatically.

These are Microsoft’s documented new Outlook reinstall steps.^5^

5. Escalate if it fails everywhere

Contact Microsoft Support if all these conditions apply:

• The same account fails in both new Outlook and Outlook on the web.
• It fails through two independent networks.
• Repair, Reset, and reinstall do not change the error.

Include the complete error details, UTC timestamp, client version, BootResult: network, esrc: StartupData, and whether other Microsoft accounts can open in new Outlook. For a Microsoft 365 Home subscription, the current known-issues page provides a Contact Us support path.^2^

References

1. Computer is on a new router/wifi - getting the following error message ...
2. Fixes or workarounds for recent issues in new Outlook for Windows ...
3. [Windows 11](https://support.microsoft.com/windows/apps/repair-apps-and-programs-in-windows#summary)
4. Resolve Outlook for Windows issues with automated troubleshooting tools
5. Outlook for Windows not responding, hangs, freezes, or stops working | Microsoft Support